Startup Says Former Director's Company Has Alleged Breach of Contract

Arista Networks Inc. disclosed plans to go public that come with an unusual twist: a dispute with one of its founders over software used in the startup's networking hardware.

The Silicon Valley company said it received breach-of-contract allegations from a company called Optumsoft Inc. that was founded by David Cheriton, a Stanford University computer science professor who stepped down from Arista's board of directors on March 1.